Lavani, Spectre Blademaster

White creatures you control get +1/+1.
Whenever a Black permanent enters the battlefield you may pay 2 life, if you do scry 2, draw 2 cards then discard a card.
{x}{r}{b}: Lavani deals X damage to target creature, if a creature would die this way
exile it. You may cast that creature from
exile until your next turn and use any color
of mana to cast it.